Internal combustion engine piston - has zones of forged pptn.-hardening steel contg. carbon, silicon, manganese, phosphorus, sulphur and vanadium

摘要

Piston has light metal hubs and other areas, partic. piston body, with areas, partic. those adjacent the combustion chamber, of pptn. - hardening forged steel, contg. (%) 0.32-0.45 C, 0.4-0.9 Si, 1.0-1.8 Mn, up to 0.035 P, up to 0.065 S, and 0.06-0.15 V. ADVANTAGE - Cheaper steel than that previously used, partic. cheap to work, with comparable properties.